Electric elevator-door interlock



R. c. GREEN ELECTRIC ELEVATOR DOOR INTERLOCK April 29, 1930.

Filed Feb. 9, 192a Patented Apr. 29 1930 UNITED STATES RAY C. GREEN, OF SALT LAKE CITY, UTAH ELECTRIC ELEVATOR-DOOR INTERLOGK Application filed. February 9, 1928. Serial No. 253,178.

This invention relates to an improved electric elevator door interlock of the type where the motor circuit is opened or closed by the opening or closing, respectively, of any of the doors leading into the elevator shaft. Thus,

the motor cannot be started unless all the doors are closed. While the present invention finds a wide field of application in connection with elevator doors, its use is not necessarily restricted thereto.

The features of this invention for which the protection of Letters Patent of the United States is desired, are collectively grouped in the claims concluding this specification.

In the drawing,

Fig. 1 represents a front elevation of one embodiment of the interlock in operative position on the door of an elevator, portions being broken away;

Fig. 2, atop plan, partly in sectionon line 22, Fig. 1;

Fig. 3, a portion of Fig. 1 showing certain parts in an alternate position;

' Fig. 4, a fragmentary elevation of a modified construction; and

F ig. 5, a fragmentary elevation of still another modified construction.

Referring to the drawing, the numeral 10 indicates the elevator door, and 12 and 13, the door-jambs. Rigidly attached to the plate 10 forming part of the door, is the box 40, and pivotally mounted at 14, within the box, is the oscillating combined latchbolt and contact member or arm 15 with the notched forward portion 16. Secured in the head 17 of the latch bolt 15, is the insulating block 18 on which is rigidly mounted the electrical conductor 19, which latter is of sufiicient length to extend across the two contact fingers 20. These fingers are mounted on the insulating block 21 and have the terminals 24, to which are connected the feed wires 25 and 26. Bearing down on the head 17 is the pressure block 27 actuated by gravity. If desired, the pressure block may be further acted upon by the compression spring 28 strung on the stationary bolt 29. The head of the latter serves as a stop for the pressure block.

Pivoted at 30 in the box 40, are the links 31. One end of each link is slotted as indicated at 32, and these slotted ends in common engage a pin 34 mounted in the body of the latch bolt 15, to one side of the pivot 14. Pivotally connected to the links 31, by means of the pin 35, is the operating rod 36 which terminates at its opposite end in the handle 37 In order to support and guide the handle end of the rod 36, a screw 38 may be threaded in the plate 10 and locked by means of the nut 39. I

The latch bolt 15 and its operating parts, being encased in the box 40 which is provided with the removable cover 41, are fully protected. The head 17 of the latch bolt, protrudes from the box 40 for engaging its cooperative parts on the jamb when the door is closed. The various parts carried on the jamb are enclosed in the box 42 having the cover 43. The box 42 has the opening 45 defined therein, through which the head 17 is admit-ted. Fig. 1 shows the lock in the closed position of the door, while in Fig. 3, the raised position of the latch bolt is shown just before the door is opened.

In operation, the handle 37 is grasped and pulled over, in this instance towards the left, whereby the rod 36 acts to pull the links 31 toward the vertical position, which results in the lifting of the latch bolt from the position indicated in Fig. 1 to the position shown in Fig. 3. To be operative, itis obvious that the center line connecting pivots 30 and 34 to each other, must make other than a right angle with the center line connecting pivots 14 and 32 to each other.

In the modification shown in Fig. 4, the latch bolt has its pin 34engaged in the inclined slot defined in the oscillating link 50 which is pivoted at 51 in a box '60 rigidly attached to the door.

A further modification is shown in Fig. 5. Here the" latch bolt 52 has defined in it the inclined slot 53, in which is engaged the pin 54, which latter is fixed in the free extremity of oscillating link 56. The link 56 oscillates about the pin 57 which is fixed in the box 61.

In both the modifications just mentioned, the rod 36 is connected to the oscillating links 50 and 56, by means of its pivot pin 35, so that when the rod 36 is drawn to the left, it is obvious that the latch bolts 15 and 52, respectively, will be lifted in the desired manner. In these modifications, the oscillating links 50 and 56 make a right angle with the latch bolt at some point of the stroke.

I am aware that it is not new to use an oscillating latch bolt carrying an insulating block and having a bridging contact member on its -face,'nor to use a pressure block for forcing the contact between. the said bridging member and two electrical terminals. Therefore, I do not claim these parts broadly, but only in combination with the new actuatingmechanism which I have evolved.

While a specific embodiment of my invention, is herein shown and described, it is to be understood that various changes could be madev therein without departing from the spiritand scope of the invention as defined in. the: claims.

Having fullyfdescribed my invention, What I claim is: r

. 1. In-an electric elevator door interlock, a d.oor,an oscillating latch bolt having one end thereof pivoted at a point fixed relativelyto the door, a pin in said latch bolt, a link pivoted at a second point fixed relatively to the door, a slot defined in said; link, the slotted portion engaging said pin, and means for oscillating said link.

2. Thecombina-tion with an elevator door and an electric interlock including a latch bolt pivoted on thedoor, a pressure block normally bearing on the said latch bolt, a contact strip on the swinging end of said latch bolt, and terminal contacts spaced apart from each other adjacent the swinging end of said.

latch bolt, said contact strip'normally bearing on said terminal contacts, of an oscillating link having a fixed end and a free end, said free end inengagement with the swinging end of said latch bolt, and an operating member engaging said link. 7

3. The combination with a door and an electric elevator door interlock including a door jamb .havinga box attached thereto, an opening defined inone end of said box, electrical contacts spaced apart from each other in: said box, a pressure block spaced apart from said contacts, a door movable relatively door box, the other end of said arm protruding from the door box; an electrical contact member carried on said oscillating arm and insulated therefrom, contact terminals spaced apart from each other in said jamb box, and a pressure block bearing against the said oscillating arm when said elevator door is closed, of .an oscillating .link axially-fixed within said door box, said link having a slotted portion, a pin disposed in said oscillating arm to one side of the arm axis, and a reciprocating member engaging said link.

5. The combination with an elevator door having an electric interlock including a latch bolt, a pressure block'normally bearing on said-latchbolt, a contact strip on the swing in-g, end of said latch bolt, and terminal contactsspaced apart from each other adjacent the said. swinging end, said contact strip normally bearingon said terminal contacts, of an oscillating. link having one end thereofpivoted at a fixed point relatively to said door, the free end of said link in operative engagementwith said latch, and means operative to reciprocate said link.

6.. A door, an oscillating latch bolt having one end thereof pivoted at a point fixed rela-v tively tothe door, a link pivoted at a second point fixed relatively to the door, and a pin and coacting slotted portion connecting said latch bolt to said link; the axis of said slotted portion inclined relatively to the oscillating axis of said latch bolt. c

In testimony whereof I sign my name here- RAY C. GREEN.

to said jamb, a pivoted latch bolt carried by said door, said latch bolt having a head insertable through said opening and, into the space between said contacts and said pressure block; of an oscillating link having one. end thereof pivoted on said door, a slotted portion eifective to cause-said link to engage said latch bolt, and means operable to oscillate said link.

4. The combination with an elevator door, a jamb adjacent said door, a box on said door, a second box on said j amb, an oscillating arm having one endthereof pivoted within the 

